| Professional Committee of Rock and Mineral Testing Technology of the Geological Society of China, National Geological Experiment and Testing Center | Host |
| Citation: |
HU Yaoyao, WANG Haozheng, HOU Yuyang, SONG Haoran. A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis[J]. Rock and Mineral Analysis, 2022, 41(2): 260-271. doi: 10.15898/j.cnki.11-2131/td.202109280132
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A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis
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Abstract
BACKGROUND The estimation of bulk composition of the micro-area of a rock is an important basis of tracing rock evolution. The conventional electron probe microanalysis (EPMA) mapping method cannot provide quantitative analysis results of the surface scanning area.
OBJECTIVES In order to estimate the composition of the micro-area by quantitative mapping of EPMA.
METHODS The mapping and point analyses were carried out to determine the composition of the micro-area of a homogeneous quartz-diorite. By performing image correction of the pixels of the mapping of the major elements, and using the point analysis data after ZAF correction and the gray value of the surface scan image to perform the least square curve fitting method, the X-ray intensity and concentration were converted.
RESULTS By comparing to X-ray fluorescence spectrometry (XRF), the relative errors of SiO2, CaO, FeO, Al2O3 and TiO2 of EPMA method were within 10%, and the relative standard deviation was less than 10%. The relative error and standard deviation of MgO and Na2O were slightly larger, which can be improved by multiple measurements. The K2O content were not accurate due to lack of K-rich silicate minerals' point analysis.
CONCLUSIONS The results show that the estimation of micro-area composition of a rock with relatively homogeneous mineral distributions can be carried out by using point analyses of EPMA to correct the mapping under good instrument conditions, and the influence of mineral morphology, particle size, and distribution can be reduced by multiple measurements on different sections.
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References
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HU Yaoyao, WANG Haozheng, HOU Yuyang, SONG Haoran. A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis[J]. Rock and Mineral Analysis, 2022, 41(2): 260-271. doi: 10.15898/j.cnki.11-2131/td.202109280132
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Figure 1.
Field outcrop and microscopic characteristics of Neoproterozoic magmatic quartz-diorite in Micangshan, northern Sichuan. (a, d—Field photos of quartz-diorite which has subhedral granular texture and massive structure; b, c—Plagioclase is enhedral with a turbid surface, and the quartz is subhedral to anhedral distributed around amphibole and plagioclase; e, f—Amphibole is subhedral to anhedral, and contain opaque metallic minerals are founded in amphibole and plagioclase. Mineral abbreviation: Amp—amphibole; Pl—plagioclase; Qz—quartz; Opq—opaque mineral)
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Figure 2.
Backscattered electron image of mapping area and positions of point analyses (Dots represent the position of the simulated point analyses and the numbers in the figure represent the serial number of the article test data. a—The plagioclase formed in the early stage is enhedral crystal. b—The middle part of enhedral plagioclase is alterated into epidote. c—The edge of anhedral amphibole is covered with quartz, ilmenite and K-rich silicate minerals, while apatite, ilmenite and other inclusions exist in it. d—Subhedral ilmenite and magnetite are distributed at the edge of plagioclase and amphibole)
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Figure 3.
Curve fitting results of grayscale of pixels and point analyses
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Figure 4.
Phase composition mappings of the minerals. (a, d—The composition of Al2O3 of plagioclase is relatively homogeneous in the corrected image compared to the uncorrected mapping, showing a weak change in modal abundance. b, e— In mapping of Na2O, the composition of plagioclase is inhomogeneous and the count is lost. However, after image processing the composition of plagioclase is homogeneous. c, f— In CaO mapping, the interior of plagioclase is altered. g, j—The composition of minerals is homogeneou and MgO content of amphibole is relatively high in the corrected image compared to the uncorrected mapping, containing ilmenite and other inclusions. h, k—In K2O mapping, amphibole and plagioclase are difficult to distinguish and K-rich silicate minerals exist at the edge. However, after image processing the K2O content of amphibole is obviously higher than that of plagioclase and K-rich silicate minerals are obvious. i, l—Amphibole contains a small amount of TiO2, grain boundary is clear, and ilmenite and magnetite are distributed at the edge in the corrected image compared to the uncorrected mapping. Mineral abbreviation: Amp—amphibole; Pl—plagioclase; Qz—quartz; Ilm—ilmenite; Mag—magnetite)